How to get BLE SD free/used memory?

[Martin]

Hi, is there a function that returns free or used memory of the BLE SD? I'd like to know how much memory is allocated for added service and characteristic and make a guess how many services and chars I can further add. I mean case where attribute data are stored in SD memory (double buffer). Currently I have no idea how many e.g. 20B attributes I can allocate.

[Martin]

Well I found older post that explains there's 1,5kB of fixed allocated RAM in BLE SD for all GATT stuff. http://devzone.nordicsemi.com/index.php/sd-characteristics-per-service-limit#reply-827 But I still have no idea what internal overhead the services and characteristic have and how can I get amount of available memory in this pool.

[Martin]

When I tried trial-error method of adding services until error I ended on number 47. It was services without any characteristic. When I add one 20B characteristic per service it significantly dropper to only 10 services. In this case I use location in BLE SD, how can I increase it if I will use user memory for value location? I guess maybe 20-30 but it is still not much...